[Solved] What is wrong with this task definition in cypress.config.js? tasks: { readFile(path) { const fs = require('fs') return fs.... What is wrong with this task definition in cypress.config.js? | Cypress

Cypress - Plugins and Ecosystem

What is wrong with this task definition in cypress.config.js?

tasks: {
  readFile(path) {
    const fs = require('fs')
    return fs.readFileSync(path, 'utf8')
  }
}

When called as cy.task('readFile', 'data.txt'), it throws an error.

AThe task function must return a Promise or value, but <code>readFileSync</code> is synchronous

BThe task should be defined as an async function returning a Promise

CTasks cannot accept arguments

DThe <code>require</code> statement is not allowed inside tasks

Step-by-Step Solution

Solution:

Step 1: Understand task function requirements
Cypress tasks should return a value or a Promise. Using synchronous readFileSync is allowed but can cause blocking issues.
Step 2: Identify best practice for async operations
To avoid errors and improve performance, tasks reading files should be async and return a Promise, e.g., using fs.promises.readFile.
Step 3: Analyze the error cause
The error likely occurs because Cypress expects a Promise for async tasks, so defining the task as async fixes it.
Final Answer:
The task should be defined as an async function returning a Promise -> Option B
Quick Check:
Async tasks return Promises = D [OK]

Quick Trick: Use async functions for tasks doing file I/O [OK]

Common Mistakes:

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What is wrong with this task definition in cypress.config.js?